City of Heavenly Fire is a young adult fantasy romance novel, the sixth and final installment in The Mortal Instruments series, and chronologically the twelfth installment in The Shadowhunter Chronicles franchise by Cassandra Clare. It was released on May 27, 2014. The book once again follows the adventures of the teenage Shadowhunter, Clary Fray, and her allies in facing her brother Sebastian Morgenstern and his allies of Endarkened Shadowhunters. It also ties in with both The Infernal Devices and The Dark Artifices series by having their main protagonists, Tessa Gray and Emma Carstairs, appear as supporting characters and connecting the worlds of The Infernal Devices and The Dark Artifices.

The Mortal Instruments is a series of six young adult fantasy novels written by American author Cassandra Clare, the last of which was published on May 27, 2014. The Mortal Instruments is chronologically the third series of a planned six in The Shadowhunter Chronicles but was the first one published. It follows Clary Fray, who interacts with a group of Nephilim known as Shadowhunters while also discovering her own heritage and her family history. The Shadowhunters protect the world of mundane/human people, who are also called mundanes or "mundies", from dark forces beyond their world. The book series falls under the young adult genre, specifically that of the paranormal romance/urban fantasy and supernatural genres.